>would be anyway useful to clarify what this "datum_trans" option means.
an example of the datum Hermannskogel [1] aka MGI [2]. this datum goes back to the Austrian-Hungary monarchy which covered the area of Austria, Hungary, Slovenia, etc. this datum was used in all these countries, but adapted for several regions (have look at [3]). this means that you can use the MGI datum for Austria, the Balcan countries etc, but you have to use different +towgs parameters adapted for the respective regions/countries which is needed for reprojection. and here the "datum_trans" option is needed to define these different +towgs parameters. HTH [1] https://de.wikipedia.org/wiki/Datum_Austria [2] https://de.wikipedia.org/wiki/MGI [3] http://epsg.io/?q=MGI ----- best regards Helmut -- View this message in context: http://osgeo-org.1560.x6.nabble.com/v-import-and-v-proj-errors-tp5279106p5279130.html Sent from the Grass - Users mailing list archive at Nabble.com. _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
